package liulin.com.discount.view;

/**
 * Created by LiuLin on 2017/3/20.
 */
import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v4.content.ContextCompat;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import android.widget.EditText;

import liulin.com.discount.R;


/**
 * @说明： 自定义带删除按钮的EditText
 *
 */
public class ClearEditText extends EditText implements OnFocusChangeListener,
        TextWatcher {
        //EditText右侧的删除按钮
        private Drawable mClearDrawable;
        private boolean hasFoucs;
        final int version=  Build.VERSION.SDK_INT;

        public ClearEditText(Context context) {
            this(context, null);
        }

        public ClearEditText(Context context, AttributeSet attrs) {
            this(context, attrs, android.R.attr.editTextStyle);
        }

    public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    private void init(Context context) {
        // 获取EditText的DrawableRight,假如没有设置我们就使用默认的图片,获取图片的顺序是左上右下（0,1,2,3,）
        mClearDrawable = getCompoundDrawables()[2];
        if (mClearDrawable == null) {
            if (version >= 21) {
                mClearDrawable = ContextCompat.getDrawable(context, R.drawable.btn_logindelete_selector);
            } else {
                mClearDrawable = context.getResources().getDrawable(R.drawable.btn_logindelete_selector);
            }
        }

        mClearDrawable.setBounds(0, 0, (mClearDrawable.getIntrinsicWidth())*2/3,
                (mClearDrawable.getIntrinsicHeight())*2/3);
        // 默认设置隐藏图标
        setClearIconVisible(false);
        // 设置焦点改变的监听
        setOnFocusChangeListener(this);
        // 设置输入框里面内容发生改变的监听
        addTextChangedListener(this);
    }

        /* @说明：isInnerWidth, isInnerHeight为ture，触摸点在删除图标之内，则视为点击了删除图标
         * event.getX() 获取相对应自身左上角的X坐标
         * event.getY() 获取相对应自身左上角的Y坐标
         * getWidth() 获取控件的宽度
         * getHeight() 获取控件的高度
         * getTotalPaddingRight() 获取删除图标左边缘到控件右边缘的距离
         * getPaddingRight() 获取删除图标右边缘到控件右边缘的距离
         * isInnerWidth:
         *  getWidth() - getTotalPaddingRight() 计算删除图标左边缘到控件左边缘的距离
         *  getWidth() - getPaddingRight() 计算删除图标右边缘到控件左边缘的距离
         * isInnerHeight:
         *  distance 删除图标顶部边缘到控件顶部边缘的距离
         *  distance + height 删除图标底部边缘到控件顶部边缘的距离
         */
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                if (getCompoundDrawables()[2] != null) {
                    int x = (int)event.getX();
                    int y = (int)event.getY();
                    Rect rect = getCompoundDrawables()[2].getBounds();
                    int height = rect.height();
                    int distance = (getHeight() - height)/2;
                    boolean isInnerWidth = x > (getWidth() - getTotalPaddingRight()) && x < (getWidth() - getPaddingRight());
                    boolean isInnerHeight = y > distance && y <(distance + height);
                    if (isInnerWidth && isInnerHeight) {
                        this.setText("");
                    }
                }
            }
            return super.onTouchEvent(event);
        }

        /**
         * 当ClearEditText焦点发生变化的时候，
         * 输入长度为零，隐藏删除图标，否则，显示删除图标
         */
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            this.hasFoucs = hasFocus;
            if (hasFocus) {
                setClearIconVisible(getText().length() > 0);
            } else {
                setClearIconVisible(false);
            }
        }

        protected void setClearIconVisible(boolean visible) {
            Drawable right = visible ? mClearDrawable : null;
            setCompoundDrawables(getCompoundDrawables()[0],
                    getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int count, int after) {
            if (hasFoucs) {
                setClearIconVisible(s.length() > 0);
            }
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                                      int after) {

        }

        @Override
        public void afterTextChanged(Editable s) {

        }
}
